I installed today Ubuntu 12.10 (64 bit !!) and Mate 1.4.2 Desktop.
My regular resolution is 1680x1050 but it allowed me only 1024x768.
OK, so i read a little and installed the nvidia drivers using the apt-get install nvidia-current and also nvidia-current-update.
But it did no good. now i have 800x600 resolution. I tried to remove it and re-install but it didn't help. I also tried to install the driver manually (downloading the .run file) but it failed becuase of some missing kernel (after i finally found that i need to stop lightdm in order to install it). Well, i m really frustrated.